diff --git a/target/sparc/insns.decode b/target/sparc/insns.decode
index 76e812cc74..818ac33f2f 100644
--- a/target/sparc/insns.decode
+++ b/target/sparc/insns.decode
@@ -284,6 +284,10 @@ STD         11 ..... 010111 ..... . .............          @r_r_i_asi # STDA
 STX         11 ..... 011110 ..... . .............          @r_r_r_asi # STXA
 STX         11 ..... 011110 ..... . .............          @r_r_i_asi # STXA
 
+LDSTUB      11 ..... 001101 ..... . .............          @r_r_ri_na
+LDSTUB      11 ..... 011101 ..... . .............          @r_r_r_asi # LDSTUBA
+LDSTUB      11 ..... 011101 ..... . .............          @r_r_i_asi # LDSTUBA
+
 NCP         10 ----- 110110 ----- --------- -----          # v8 CPop1
 NCP         10 ----- 110111 ----- --------- -----          # v8 CPop2
 
diff --git a/target/sparc/translate.c b/target/sparc/translate.c
index dc3586853b..70d0ed3db3 100644
--- a/target/sparc/translate.c
+++ b/target/sparc/translate.c
@@ -1891,13 +1891,6 @@ static void gen_swap(DisasContext *dc, TCGv dst, TCGv src,
     tcg_gen_atomic_xchg_tl(dst, addr, src, mmu_idx, memop | MO_ALIGN);
 }
 
-static void gen_ldstub(DisasContext *dc, TCGv dst, TCGv addr, int mmu_idx)
-{
-    TCGv m1 = tcg_constant_tl(0xff);
-    gen_address_mask(dc, addr);
-    tcg_gen_atomic_xchg_tl(dst, addr, m1, mmu_idx, MO_UB);
-}
-
 /* asi moves */
 typedef enum {
     GET_ASI_HELPER,
@@ -2316,13 +2309,14 @@ gen_casx_asi(DisasContext *dc, TCGv addr, TCGv cmpv, int insn, int rd)
     gen_store_gpr(dc, rd, oldv);
 }
 
-static void gen_ldstub_asi0(DisasContext *dc, DisasASI *da, TCGv dst, TCGv addr)
+static void gen_ldstub_asi(DisasContext *dc, DisasASI *da, TCGv dst, TCGv addr)
 {
     switch (da->type) {
     case GET_ASI_EXCP:
         break;
     case GET_ASI_DIRECT:
-        gen_ldstub(dc, dst, addr, da->mem_idx);
+        tcg_gen_atomic_xchg_tl(dst, addr, tcg_constant_tl(0xff),
+                               da->mem_idx, MO_UB);
         break;
     default:
         /* ??? In theory, this should be raise DAE_invalid_asi.
@@ -2350,15 +2344,6 @@ static void gen_ldstub_asi0(DisasContext *dc, DisasASI *da, TCGv dst, TCGv addr)
     }
 }
 
-static void __attribute__((unused))
-gen_ldstub_asi(DisasContext *dc, TCGv dst, TCGv addr, int insn)
-{
-    DisasASI da = get_asi(dc, insn, MO_UB);
-
-    gen_address_mask(dc, addr);
-    gen_ldstub_asi0(dc, &da, dst, addr);
-}
-
 static void __attribute__((unused))
 gen_ldf_asi(DisasContext *dc, TCGv addr, int insn, int size, int rd)
 {
@@ -4723,6 +4708,23 @@ static bool trans_STD(DisasContext *dc, arg_r_r_ri_asi *a)
     return advance_pc(dc);
 }
 
+static bool trans_LDSTUB(DisasContext *dc, arg_r_r_ri_asi *a)
+{
+    TCGv addr, reg;
+    DisasASI da;
+
+    addr = gen_ldst_addr(dc, a->rs1, a->imm, a->rs2_or_imm);
+    if (addr == NULL) {
+        return false;
+    }
+    da = resolve_asi(dc, a->asi, MO_UB);
+
+    reg = gen_dest_gpr(dc, a->rd);
+    gen_ldstub_asi(dc, &da, reg, addr);
+    gen_store_gpr(dc, a->rd, reg);
+    return advance_pc(dc);
+}
+
 #define CHECK_IU_FEATURE(dc, FEATURE)                      \
     if (!((dc)->def->features & CPU_FEATURE_ ## FEATURE))  \
         goto illegal_insn;
@@ -5551,21 +5553,20 @@ static void disas_sparc_legacy(DisasContext *dc, unsigned int insn)
                 case 0x3:       /* ldd, load double word */
                 case 0x9:       /* ldsb, load signed byte */
                 case 0xa:       /* ldsh, load signed halfword */
+                case 0xd:       /* ldstub */
                 case 0x10:      /* lda, V9 lduwa, load word alternate */
                 case 0x11:      /* lduba, load unsigned byte alternate */
                 case 0x12:      /* lduha, load unsigned halfword alternate */
                 case 0x13:      /* ldda, load double word alternate */
                 case 0x19:      /* ldsba, load signed byte alternate */
                 case 0x1a:      /* ldsha, load signed halfword alternate */
+                case 0x1d:      /* ldstuba */
                     g_assert_not_reached();  /* in decodetree */
                 case 0x08:      /* V9 ldsw */
                 case 0x0b:      /* V9 ldx */
                 case 0x18:      /* V9 ldswa */
                 case 0x1b:      /* V9 ldxa */
                     goto illegal_insn;  /* in decodetree */
-                case 0xd:       /* ldstub */
-                    gen_ldstub(dc, cpu_val, cpu_addr, dc->mem_idx);
-                    break;
                 case 0x0f:
                     /* swap, swap register with memory. Also atomically */
                     cpu_src1 = gen_load_gpr(dc, rd);
@@ -5573,9 +5574,6 @@ static void disas_sparc_legacy(DisasContext *dc, unsigned int insn)
                              dc->mem_idx, MO_TEUL);
                     break;
 #if !defined(CONFIG_USER_ONLY) || defined(TARGET_SPARC64)
-                case 0x1d:      /* ldstuba -- XXX: should be atomically */
-                    gen_ldstub_asi(dc, cpu_val, cpu_addr, insn);
-                    break;
                 case 0x1f:      /* swapa, swap reg with alt. memory. Also
                                    atomically */
                     cpu_src1 = gen_load_gpr(dc, rd);
